[PATCH] [Polly][Fix] Teach the IslExprBuilder about vector lanes

[Johannes Doerfert]

Simplified the code and allowed only one Id to have an offset called vector lane

http://reviews.llvm.org/D5704

Files:
  include/polly/CodeGen/IslExprBuilder.h
  lib/CodeGen/BlockGenerators.cpp
  lib/CodeGen/IslCodeGeneration.cpp
  lib/CodeGen/IslExprBuilder.cpp
  test/Isl/CodeGen/MemAccess/simple_stride2___%for.cond---%for.end.jscop
  test/Isl/CodeGen/MemAccess/simple_stride___%for.cond---%for.end.jscop.unknown_stride
  test/Isl/CodeGen/MemAccess/simple_stride_test.ll
  test/Isl/CodeGen/MemAccess/simple_stride_test_2.ll
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